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DIGESTION AND ABSORPTION            221
bile and pancreatic ducts open into It together cr separately. Yalvulse conniventes are absent, and there are five Peyer's patches. The vermiform appendix is long, and opens, according to Kohlbriigge il99}, into the terminal part of the caecum. This arrangement is present in several Gibbons seen by myself. The colon is about twice the length of the body, and its ascending part has many longitudinal and transverse folds which give it a reticulated appearance.
The Peritoneum.
In the Chimpanzee the great omentum is heavily laden with fat and reaches the syraphysis pubis. All four layers are fused and can only be separated at the stomach and transverse colon. The anterior layers are attached to the greater gastric curvature, the first part of the duodenum and spleen, and bands connect it to the lateral abdominal parietes. Between the layers are the usual vessels and lymphatic glands.
The lesser omentum is attached as in Man, and the foramen of Winslow is large. It is bulged forwards above the stomach. Between its layers are numerous vessels, sympathetic nerves and lymphatic glands.
No gastro-pancreatic folds are present. The gastro-phrenic, gastro-splenic and lieno-renal ligaments are well marked. A peritoneal ligament connects the lower pole of the spleen to the transverse colon, and a small accessory spleen is connected to the colon at the same point. A well-marked ligament connects the pylorus to the right ribs, but no suspensory duodenal muscle exists.
The root of the mesentery of the small intestine runs